<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<input id="btn"type="button" value="按钮" />
<script>
var obtn=document.getElementById('btn')
function abc()
{
	alert('a')
};

obtn.value=abc
//alert('obtn.value='abc'')



</script>
</body>
</html>
